为什么在DTO中覆盖toString方法 [英] Why to override toString Method inside DTO

问题描述

我看到DTO对象中的大部分时间，
toString方法被动作覆盖。

I see that Most of the times in the DTO object , the toString Method is actaully overridden .

例如：

public class Person implements Serializable {

    private String firstName;
    private String lastName;
    private int age;

    /**
     * Creates a new instance of Person
     */
    public Person() {
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    //Overriding toString to be able to print out the object in a readable way
    //when it is later read from the file.
    public String toString() {

        StringBuffer buffer = new StringBuffer();
        buffer.append(firstName);
        buffer.append("\n");
        buffer.append(lastName);
        buffer.append("\n");
        buffer.append(age);
        buffer.append("\n");

        return buffer.toString();
    }


}

请问有人吗？告诉我这样做有什么用？

Could anybody please tell me what is the use of doing so ??

推荐答案

答案在你的代码评论中。调试时，您希望能够打印对象的可读表示形式。如果你不覆盖 toString ，你很可能会有如下表示：

The answer is in your code comment. When debugging, you want to be able to print a human readable representation of your object. If you don't override toString you will most likely have a representation like:

Person@129cfbb

这篇关于为什么在DTO中覆盖toString方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！